The seismometer aboard NASA’s InSight lander recorded two of the strongest earthquakes ever recorded on Mars: a magnitude of 4.2 and a magnitude of 4.1. Seismic activity helps scientists gain a deeper understanding of Mars’ internal structure. The magnitude 4.2 event, dubbed S0976a, was located to originate from Valles Marineris, the largest canyon on Mars and one of the largest graben systems in the solar system. This is the first confirmation of seismic activity in the area. The magnitude 4.1 event, dubbed S1000a, was characterized by reflected PP and SS waves, as well as Pdiff waves, which were first detected by the InSight mission. Because of the telemetry that took place on Mars, its location has not been determined. S1000a lasted 94 minutes, the longest seismic energy ever recorded on Mars.
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